set @subselect_mat_test_optimizer_switch_value='materialization=on,in_to_exists=off,semijoin=off'; set @subselect_sj_mat_tmp= @@optimizer_switch; set optimizer_switch=ifnull(@subselect_mat_test_optimizer_switch_value, 'semijoin=on,firstmatch=on,loosescan=on'); set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on'; set @optimizer_switch_local_default= @@optimizer_switch; drop table if exists t1, t2, t3, t1i, t2i, t3i; drop table if exists columns; drop table if exists t1_16, t2_16, t3_16; drop view if exists v1, v2, v1m, v2m; create table t1 (a1 char(8), a2 char(8)); create table t2 (b1 char(8), b2 char(8)); create table t3 (c1 char(8), c2 char(8)); insert into t1 values ('1 - 00', '2 - 00'); insert into t1 values ('1 - 01', '2 - 01'); insert into t1 values ('1 - 02', '2 - 02'); insert into t2 values ('1 - 01', '2 - 01'); insert into t2 values ('1 - 01', '2 - 01'); insert into t2 values ('1 - 02', '2 - 02'); insert into t2 values ('1 - 02', '2 - 02'); insert into t2 values ('1 - 03', '2 - 03'); insert into t3 values ('1 - 01', '2 - 01'); insert into t3 values ('1 - 02', '2 - 02'); insert into t3 values ('1 - 03', '2 - 03'); insert into t3 values ('1 - 04', '2 - 04'); create table t1i (a1 char(8), a2 char(8)); create table t2i (b1 char(8), b2 char(8)); create table t3i (c1 char(8), c2 char(8)); create index it1i1 on t1i (a1); create index it1i2 on t1i (a2); create index it1i3 on t1i (a1, a2); create index it2i1 on t2i (b1); create index it2i2 on t2i (b2); create index it2i3 on t2i (b1, b2); create index it3i1 on t3i (c1); create index it3i2 on t3i (c2); create index it3i3 on t3i (c1, c2); insert into t1i select * from t1; insert into t2i select * from t2; insert into t3i select * from t3; set @@optimizer_switch='materialization=on,in_to_exists=off,firstmatch=off'; /****************************************************************************** * Simple tests. ******************************************************************************/ # non-indexed nullable fields explain extended select * from t1 where a1 in (select b1 from t2 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( (select `test`.`t2`.`b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`))))) select * from t1 where a1 in (select b1 from t2 where b1 > '0'); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( (select `test`.`t2`.`b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1` ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`))))) select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`) and (`test`.`t1`.`a2` = ``.`b2`))))) select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t2`.`b1`,min(`test`.`t2`.`b2`) from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1` ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`) and (`test`.`t1`.`a2` = ``.`min(b2)`))))) select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1i where a1 in (select b1 from t2i where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1i index NULL _it1_idx # NULL 3 100.00 Using where; 2 SUBQUERY t2i index it2i1,it2i3 it2i1 # NULL 5 100.00 Using where; Warnings: Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where (`test`.`t1i`.`a1`,`test`.`t1i`.`a1` in ( (select `test`.`t2i`.`b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`b1`))))) select * from t1i where a1 in (select b1 from t2i where b1 > '0'); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1i index NULL # 18 # 3 100.00 # 2 SUBQUERY t2i range it2i1,it2i3 # 9 # 3 100.00 # Warnings: Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where (`test`.`t1i`.`a1`,`test`.`t1i`.`a1` in ( (select `test`.`t2i`.`b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`b1`))))) select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1i index NULL _it1_idx # NULL 3 100.00 Using where; 2 SUBQUERY t2i index it2i1,it2i3 it2i3 # NULL 5 100.00 Using where; Warnings: Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where ((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`b1`) and (`test`.`t1i`.`a2` = ``.`b2`))))) select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0'); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1i index NULL # # # 3 100.00 # 2 SUBQUERY t2i range it2i1,it2i3 # # # 3 100.00 # Warnings: Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where ((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`,`test`.`t2i`.`b2` ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`b1`) and (`test`.`t1i`.`a2` = ``.`b2`))))) select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1i index NULL # # # 3 100.00 # 2 SUBQUERY t2i range it2i1,it2i3 # # # 3 100.00 # Warnings: Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where ((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( (select `test`.`t2i`.`b1`,min(`test`.`t2i`.`b2`) from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`b1`) and (`test`.`t1i`.`a2` = ``.`min(b2)`))))) select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2i range NULL it2i3 9 NULL 3 100.00 Using index for group-by Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t2i`.`b1`,max(`test`.`t2i`.`b2`) from `test`.`t2i` group by `test`.`t2i`.`b1` ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`) and (`test`.`t1`.`a2` = ``.`max(b2)`))))) select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 prepare st1 from "explain select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)"; execute st1; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where 2 SUBQUERY t2i range NULL it2i3 9 NULL 3 Using index for group-by execute st1; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where 2 SUBQUERY t2i range NULL it2i3 9 NULL 3 Using index for group-by prepare st2 from "select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)"; execute st2; a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 execute st2; a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2i range it2i1,it2i3 it2i3 18 NULL 3 100.00 Using where; Using index for group-by Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t2i`.`b1`,min(`test`.`t2i`.`b2`) from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`) and (`test`.`t1`.`a2` = ``.`min(b2)`))))) select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 select * from t1 where (a1, a2) in (select b1, min(b2) from t2i limit 1,1); ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery' set @save_optimizer_switch=@@optimizer_switch; set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='semijoin=off'; prepare st1 from "select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)"; set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='materialization=off,in_to_exists=on'; execute st1; a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='semijoin=off'; execute st1; a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='materialization=off,in_to_exists=on'; prepare st1 from "select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)"; set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='semijoin=off'; execute st1; a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='materialization=off,in_to_exists=on'; execute st1; a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 set @@optimizer_switch=@save_optimizer_switch; explain extended select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` order by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`) and (`test`.`t1`.`a2` = ``.`b2`))))) select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1i index NULL it1i3 18 NULL 3 100.00 Using where; Using index 2 SUBQUERY t2i index NULL it2i3 18 NULL 5 100.00 Using index Warnings: Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where ((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` order by `test`.`t2i`.`b1`,`test`.`t2i`.`b2` ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`b1`) and (`test`.`t1i`.`a2` = ``.`b2`))))) select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 /****************************************************************************** * Views, UNIONs, several levels of nesting. ******************************************************************************/ # materialize the result of subquery over temp-table view create algorithm=merge view v1 as select b1, c2 from t2, t3 where b2 > c2; create algorithm=merge view v2 as select b1, c2 from t2, t3 group by b2, c2; Warnings: Warning 1354 View merge algorithm can't be used here for now (assumed undefined algorithm) create algorithm=temptable view v1m as select b1, c2 from t2, t3 where b2 > c2; create algorithm=temptable view v2m as select b1, c2 from t2, t3 group by b2, c2; select * from v1 where (c2, b1) in (select c2, b1 from v2 where b1 is not null); b1 c2 1 - 02 2 - 01 1 - 02 2 - 01 1 - 03 2 - 01 1 - 03 2 - 02 select * from v1 where (c2, b1) in (select distinct c2, b1 from v2 where b1 is not null); b1 c2 1 - 02 2 - 01 1 - 02 2 - 01 1 - 03 2 - 01 1 - 03 2 - 02 select * from v1m where (c2, b1) in (select c2, b1 from v2m where b1 is not null); b1 c2 1 - 02 2 - 01 1 - 02 2 - 01 1 - 03 2 - 01 1 - 03 2 - 02 select * from v1m where (c2, b1) in (select distinct c2, b1 from v2m where b1 is not null); b1 c2 1 - 02 2 - 01 1 - 02 2 - 01 1 - 03 2 - 01 1 - 03 2 - 02 drop view v1, v2, v1m, v2m; explain extended select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and (a1, a2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 3 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where 4 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index 2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`) and (`test`.`t1`.`a2` = ``.`b2`))))) and ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t3`.`c1`,`test`.`t3`.`c2` from `test`.`t3` where ((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), (`test`.`t3`.`c1` in on distinct_key where ((`test`.`t3`.`c1` = ``.`b1`) and (`test`.`t3`.`c2` = ``.`b2`))))) ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`c1`) and (`test`.`t1`.`a2` = ``.`c2`)))))) select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and (a1, a2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and (a1, a2) in (select c1, c2 from t3i where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1i index NULL # # # 3 100.00 # 3 SUBQUERY t3i index NULL # # # 4 100.00 # 4 SUBQUERY t2i index it2i2 # # # 5 100.00 # 2 SUBQUERY t2i index it2i1,it2i3 # # # 5 100.00 # Warnings: Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where (((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`b1`) and (`test`.`t1i`.`a2` = ``.`b2`))))) and ((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( (select `test`.`t3i`.`c1`,`test`.`t3i`.`c2` from `test`.`t3i` where ((`test`.`t3i`.`c1`,`test`.`t3i`.`c2`),(`test`.`t3i`.`c1`,`test`.`t3i`.`c2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), (`test`.`t3i`.`c1` in on distinct_key where ((`test`.`t3i`.`c1` = ``.`b1`) and (`test`.`t3i`.`c2` = ``.`b2`))))) ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`c1`) and (`test`.`t1i`.`a2` = ``.`c2`)))))) select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and (a1, a2) in (select c1, c2 from t3i where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1 where (a1, a2) in (select b1, b2 from t2 where b2 in (select c2 from t3 where c2 LIKE '%02') or b2 in (select c2 from t3 where c2 LIKE '%03')) and (a1, a2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 5 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where 6 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index 2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where 4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where 3 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` where ((`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( (select `test`.`t3`.`c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), (`test`.`t2`.`b2` in on distinct_key where ((`test`.`t2`.`b2` = ``.`c2`))))) or (`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( (select `test`.`t3`.`c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), (`test`.`t2`.`b2` in on distinct_key where ((`test`.`t2`.`b2` = ``.`c2`)))))) ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`) and (`test`.`t1`.`a2` = ``.`b2`))))) and ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t3`.`c1`,`test`.`t3`.`c2` from `test`.`t3` where ((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), (`test`.`t3`.`c1` in on distinct_key where ((`test`.`t3`.`c1` = ``.`b1`) and (`test`.`t3`.`c2` = ``.`b2`))))) ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`c1`) and (`test`.`t1`.`a2` = ``.`c2`)))))) select * from t1 where (a1, a2) in (select b1, b2 from t2 where b2 in (select c2 from t3 where c2 LIKE '%02') or b2 in (select c2 from t3 where c2 LIKE '%03')) and (a1, a2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); a1 a2 1 - 02 2 - 02 explain extended select * from t1 where (a1, a2) in (select b1, b2 from t2 where b2 in (select c2 from t3 t3a where c1 = a1) or b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and (a1, a2) in (select c1, c2 from t3 t3c where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 5 SUBQUERY t3c ALL NULL NULL NULL NULL 4 100.00 Using where 6 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where 4 SUBQUERY t3b ALL NULL NULL NULL NULL 4 100.00 Using where 3 DEPENDENT SUBQUERY t3a ALL NULL NULL NULL NULL 4 100.00 Using where Warnings: Note 1276 Field or reference 'test.t1.a1' of SELECT #3 was resolved in SELECT #1 Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` where (((`test`.`t2`.`b2`,(select `test`.`t3a`.`c2` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and ((`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or (`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( (select `test`.`t3b`.`c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), (`test`.`t2`.`b2` in on distinct_key where ((`test`.`t2`.`b2` = ``.`c2`)))))) and ((`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and ((`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t3c`.`c1`,`test`.`t3c`.`c2` from `test`.`t3` `t3c` where ((`test`.`t3c`.`c1`,`test`.`t3c`.`c2`),(`test`.`t3c`.`c1`,`test`.`t3c`.`c2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), (`test`.`t3c`.`c1` in on distinct_key where ((`test`.`t3c`.`c1` = ``.`b1`) and (`test`.`t3c`.`c2` = ``.`b2`))))) ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`c1`) and (`test`.`t1`.`a2` = ``.`c2`)))))) select * from t1 where (a1, a2) in (select b1, b2 from t2 where b2 in (select c2 from t3 t3a where c1 = a1) or b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and (a1, a2) in (select c1, c2 from t3 t3c where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended (select * from t1 where (a1, a2) in (select b1, b2 from t2 where b2 in (select c2 from t3 where c2 LIKE '%02') or b2 in (select c2 from t3 where c2 LIKE '%03') group by b1, b2) and (a1, a2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0'))) UNION (select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and (a1, a2) in (select c1, c2 from t3i where (c1, c2) in (select b1, b2 from t2i where b2 > '0'))); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL # # # 3 100.00 # 5 SUBQUERY t3 ALL NULL # # # 4 100.00 # 6 SUBQUERY t2i index it2i2 # # # 5 100.00 # 2 SUBQUERY t2 ALL NULL # # # 5 100.00 # 4 SUBQUERY t3 ALL NULL # # # 4 100.00 # 3 SUBQUERY t3 ALL NULL # # # 4 100.00 # 7 UNION t1i index NULL # # # 3 100.00 # 9 SUBQUERY t3i index NULL # # # 4 100.00 # 10 SUBQUERY t2i index it2i2 # # # 5 100.00 # 8 SUBQUERY t2i index it2i1,it2i3 # # # 5 100.00 # NULL UNION RESULT ALL NULL # # # NULL NULL # Warnings: Note 1003 (select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` where ((`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( (select `test`.`t3`.`c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), (`test`.`t2`.`b2` in on distinct_key where ((`test`.`t2`.`b2` = ``.`c2`))))) or (`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( (select `test`.`t3`.`c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), (`test`.`t2`.`b2` in on distinct_key where ((`test`.`t2`.`b2` = ``.`c2`)))))) group by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`b1`) and (`test`.`t1`.`a2` = ``.`b2`))))) and ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t3`.`c1`,`test`.`t3`.`c2` from `test`.`t3` where ((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), (`test`.`t3`.`c1` in on distinct_key where ((`test`.`t3`.`c1` = ``.`b1`) and (`test`.`t3`.`c2` = ``.`b2`))))) ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`c1`) and (`test`.`t1`.`a2` = ``.`c2`))))))) union (select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where (((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`b1`) and (`test`.`t1i`.`a2` = ``.`b2`))))) and ((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( (select `test`.`t3i`.`c1`,`test`.`t3i`.`c2` from `test`.`t3i` where ((`test`.`t3i`.`c1`,`test`.`t3i`.`c2`),(`test`.`t3i`.`c1`,`test`.`t3i`.`c2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), (`test`.`t3i`.`c1` in on distinct_key where ((`test`.`t3i`.`c1` = ``.`b1`) and (`test`.`t3i`.`c2` = ``.`b2`))))) ), (`test`.`t1i`.`a1` in on distinct_key where ((`test`.`t1i`.`a1` = ``.`c1`) and (`test`.`t1i`.`a2` = ``.`c2`))))))) (select * from t1 where (a1, a2) in (select b1, b2 from t2 where b2 in (select c2 from t3 where c2 LIKE '%02') or b2 in (select c2 from t3 where c2 LIKE '%03') group by b1, b2) and (a1, a2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0'))) UNION (select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and (a1, a2) in (select c1, c2 from t3i where (c1, c2) in (select b1, b2 from t2i where b2 > '0'))); a1 a2 1 - 02 2 - 02 1 - 01 2 - 01 explain extended select * from t1 where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and (a1, a2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where 5 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 5 100.00 Using where NULL UNION RESULT ALL NULL NULL NULL NULL NULL NULL Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(select `test`.`t1`.`a1`,`test`.`t1`.`a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and ((`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and ((`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and ((`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and ((`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( (select `test`.`t3`.`c1`,`test`.`t3`.`c2` from `test`.`t3` where ((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), (`test`.`t3`.`c1` in on distinct_key where ((`test`.`t3`.`c1` = ``.`b1`) and (`test`.`t3`.`c2` = ``.`b2`))))) ), (`test`.`t1`.`a1` in on distinct_key where ((`test`.`t1`.`a1` = ``.`c1`) and (`test`.`t1`.`a2` = ``.`c2`)))))) select * from t1 where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and (a1, a2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')); a1 a2 1 - 01 2 - 01 1 - 02 2 - 02 explain extended select * from t1, t3 where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and (c1, c2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and a1 = c1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY t3 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (flat, BNL join) 4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where 5 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 5 100.00 Using where NULL UNION RESULT ALL NULL NULL NULL NULL NULL NULL Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t1` join `test`.`t3` where ((`test`.`t3`.`c1` = `test`.`t1`.`a1`) and ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(select `test`.`t1`.`a1`,`test`.`t1`.`a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and ((`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and ((`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and ((`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and ((`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and ((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( (select `test`.`t3`.`c1`,`test`.`t3`.`c2` from `test`.`t3` where ((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( (select `test`.`t2i`.`b1`,`test`.`t2i`.`b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), (`test`.`t3`.`c1` in on distinct_key where ((`test`.`t3`.`c1` = ``.`b1`) and (`test`.`t3`.`c2` = ``.`b2`))))) ), (`test`.`t3`.`c1` in on distinct_key where ((`test`.`t3`.`c1` = ``.`c1`) and (`test`.`t3`.`c2` = ``.`c2`)))))) select * from t1, t3 where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and (c1, c2) in (select c1, c2 from t3 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and a1 = c1; a1 a2 c1 c2 1 - 01 2 - 01 1 - 01 2 - 01 1 - 02 2 - 02 1 - 02 2 - 02 /****************************************************************************** * Negative tests, where materialization should not be applied. ******************************************************************************/ # UNION in a subquery explain extended select * from t3 where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 4 100.00 Using where 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 5 100.00 Using where NULL UNION RESULT ALL NULL NULL NULL NULL NULL NULL Warnings: Note 1003 select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c1`,(select `test`.`t1`.`a1` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and ((`test`.`t3`.`c1`) = `test`.`t1`.`a1`)) union select `test`.`t2`.`b1` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and ((`test`.`t3`.`c1`) = `test`.`t2`.`b1`)))) select * from t3 where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9'); c1 c2 1 - 01 2 - 01 1 - 02 2 - 02 1 - 03 2 - 03 explain extended select * from t1 where (a1, a2) in (select b1, b2 from t2 where b2 in (select c2 from t3 t3a where c1 = a1) or b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and (a1, a2) in (select c1, c2 from t3 t3c where (c1, c2) in (select b1, b2 from t2i where b2 > '0' or b2 = a2)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 5 DEPENDENT SUBQUERY t3c ALL NULL NULL NULL NULL 4 100.00 Using where 6 DEPENDENT SUBQUERY t2i index_subquery it2i1,it2i2,it2i3 it2i3 18 func,func 2 100.00 Using index; Using where 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where 4 SUBQUERY t3b ALL NULL NULL NULL NULL 4 100.00 Using where 3 DEPENDENT SUBQUERY t3a ALL NULL NULL NULL NULL 4 100.00 Using where Warnings: Note 1276 Field or reference 'test.t1.a1' of SELECT #3 was resolved in SELECT #1 Note 1276 Field or reference 'test.t1.a2' of SELECT #6 was resolved in SELECT #1 Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(select `test`.`t2`.`b1`,`test`.`t2`.`b2` from `test`.`t2` where (((`test`.`t2`.`b2`,(select `test`.`t3a`.`c2` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and ((`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or (`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( (select `test`.`t3b`.`c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), (`test`.`t2`.`b2` in on distinct_key where ((`test`.`t2`.`b2` = ``.`c2`)))))) and ((`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and ((`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(select `test`.`t3c`.`c1`,`test`.`t3c`.`c2` from `test`.`t3` `t3c` where (((`test`.`t3c`.`c1`,`test`.`t3c`.`c2`),(((`test`.`t3c`.`c1`) in t2i on it2i3 where (((`test`.`t2i`.`b2` > '0') or (`test`.`t2i`.`b2` = `test`.`t1`.`a2`)) and ((`test`.`t3c`.`c1`) = `test`.`t2i`.`b1`) and ((`test`.`t3c`.`c2`) = `test`.`t2i`.`b2`))))) and ((`test`.`t1`.`a1`) = `test`.`t3c`.`c1`) and ((`test`.`t1`.`a2`) = `test`.`t3c`.`c2`))))) explain extended select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(select '1 - 01','2 - 01' having ((((`test`.`t1`.`a1`) = '1 - 01') or isnull('1 - 01')) and (((`test`.`t1`.`a2`) = '2 - 01') or isnull('2 - 01')) and ('1 - 01') and ('2 - 01')))) select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01'); a1 a2 1 - 01 2 - 01 explain extended select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01' from dual); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(select '1 - 01','2 - 01' having ((((`test`.`t1`.`a1`) = '1 - 01') or isnull('1 - 01')) and (((`test`.`t1`.`a2`) = '2 - 01') or isnull('2 - 01')) and ('1 - 01') and ('2 - 01')))) select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01' from dual); a1 a2 1 - 01 2 - 01 /****************************************************************************** * Subqueries in other uncovered clauses. ******************************************************************************/ /* SELECT clause */ select ((a1,a2) IN (select * from t2 where b2 > '0')) IS NULL from t1; ((a1,a2) IN (select * from t2 where b2 > '0')) IS NULL 0 0 0 /* GROUP BY clause */ create table columns (col int key); insert into columns values (1), (2); explain extended select * from t1 group by (select col from columns limit 1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 2 SUBQUERY columns index NULL PRIMARY 4 NULL 2 100.00 Using index Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` group by (select `test`.`columns`.`col` from `test`.`columns` limit 1) select * from t1 group by (select col from columns limit 1); a1 a2 1 - 00 2 - 00 explain extended select * from t1 group by (a1 in (select col from columns)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using temporary; Using filesort 2 DEPENDENT SUBQUERY columns unique_subquery PRIMARY PRIMARY 4 func 1 100.00 Using index; Using where; Full scan on NULL key Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` group by (`test`.`t1`.`a1`,(((`test`.`t1`.`a1`) in columns on PRIMARY where trigcond(((`test`.`t1`.`a1`) = `test`.`columns`.`col`))))) select * from t1 group by (a1 in (select col from columns)); a1 a2 1 - 00 2 - 00 /* ORDER BY clause */ explain extended select * from t1 order by (select col from columns limit 1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 2 SUBQUERY columns index NULL PRIMARY 4 NULL 2 100.00 Using index Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` order by (select `test`.`columns`.`col` from `test`.`columns` limit 1) select * from t1 order by (select col from columns limit 1); a1 a2 1 - 00 2 - 00 1 - 01 2 - 01 1 - 02 2 - 02 /****************************************************************************** * Column types/sizes that affect materialization. ******************************************************************************/ /* Test that BLOBs are not materialized (except when arguments of some functions). */ # force materialization to be always considered set @prefix_len = 6; set @blob_len = 16; set @suffix_len = @blob_len - @prefix_len; create table t1_16 (a1 blob(16), a2 blob(16)); create table t2_16 (b1 blob(16), b2 blob(16)); create table t3_16 (c1 blob(16), c2 blob(16)); insert into t1_16 values (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len))); insert into t1_16 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t1_16 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_16 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t2_16 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_16 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); insert into t3_16 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t3_16 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t3_16 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); insert into t3_16 values (concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len))); explain extended select left(a1,7), left(a2,7) from t1_16 where a1 in (select b1 from t2_16 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where (`test`.`t1_16`.`a1`,(select `test`.`t2_16`.`b1` from `test`.`t2_16` where ((`test`.`t2_16`.`b1` > '0') and ((`test`.`t1_16`.`a1`) = `test`.`t2_16`.`b1`)))) select left(a1,7), left(a2,7) from t1_16 where a1 in (select b1 from t2_16 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_16 where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where ((`test`.`t1_16`.`a1`,`test`.`t1_16`.`a2`),(select `test`.`t2_16`.`b1`,`test`.`t2_16`.`b2` from `test`.`t2_16` where ((`test`.`t2_16`.`b1` > '0') and ((`test`.`t1_16`.`a1`) = `test`.`t2_16`.`b1`) and ((`test`.`t1_16`.`a2`) = `test`.`t2_16`.`b2`)))) select left(a1,7), left(a2,7) from t1_16 where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_16 where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where (`test`.`t1_16`.`a1`,`test`.`t1_16`.`a1` in ( (select substr(`test`.`t2_16`.`b1`,1,16) from `test`.`t2_16` where (`test`.`t2_16`.`b1` > '0') ), (`test`.`t1_16`.`a1` in on distinct_key where ((`test`.`t1_16`.`a1` = ``.`substring(b1,1,16)`))))) select left(a1,7), left(a2,7) from t1_16 where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_16 where a1 in (select group_concat(b1) from t2_16 group by b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where (`test`.`t1_16`.`a1`,(select group_concat(`test`.`t2_16`.`b1` separator ',') from `test`.`t2_16` group by `test`.`t2_16`.`b2` having ((`test`.`t1_16`.`a1`) = (group_concat(`test`.`t2_16`.`b1` separator ','))))) select left(a1,7), left(a2,7) from t1_16 where a1 in (select group_concat(b1) from t2_16 group by b2); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x set @@group_concat_max_len = 256; explain extended select left(a1,7), left(a2,7) from t1_16 where a1 in (select group_concat(b1) from t2_16 group by b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where (`test`.`t1_16`.`a1`,`test`.`t1_16`.`a1` in ( (select group_concat(`test`.`t2_16`.`b1` separator ',') from `test`.`t2_16` group by `test`.`t2_16`.`b2` ), (`test`.`t1_16`.`a1` in on distinct_key where ((`test`.`t1_16`.`a1` = ``.`group_concat(b1)`))))) select left(a1,7), left(a2,7) from t1_16 where a1 in (select group_concat(b1) from t2_16 group by b2); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select * from t1 where concat(a1,'x') IN (select left(a1,8) from t1_16 where (a1, a2) IN (select t2_16.b1, t2_16.b2 from t2_16, t2 where t2.b2 = substring(t2_16.b2,1,6) and t2.b1 IN (select c1 from t3 where c2 > '0'))); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where 3 DEPENDENT SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using join buffer (flat, BNL join) 4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (concat(`test`.`t1`.`a1`,'x'),(select left(`test`.`t1_16`.`a1`,8) from `test`.`t1_16` where (((`test`.`t1_16`.`a1`,`test`.`t1_16`.`a2`),(select `test`.`t2_16`.`b1`,`test`.`t2_16`.`b2` from `test`.`t2_16` join `test`.`t2` where ((`test`.`t2`.`b2` = substr(`test`.`t2_16`.`b2`,1,6)) and (`test`.`t2`.`b1`,`test`.`t2`.`b1` in ( (select `test`.`t3`.`c1` from `test`.`t3` where (`test`.`t3`.`c2` > '0') ), (`test`.`t2`.`b1` in on distinct_key where ((`test`.`t2`.`b1` = ``.`c1`))))) and ((`test`.`t1_16`.`a1`) = `test`.`t2_16`.`b1`) and ((`test`.`t1_16`.`a2`) = `test`.`t2_16`.`b2`)))) and ((concat(`test`.`t1`.`a1`,'x')) = left(`test`.`t1_16`.`a1`,8))))) drop table t1_16, t2_16, t3_16; set @blob_len = 512; set @suffix_len = @blob_len - @prefix_len; create table t1_512 (a1 blob(512), a2 blob(512)); create table t2_512 (b1 blob(512), b2 blob(512)); create table t3_512 (c1 blob(512), c2 blob(512)); insert into t1_512 values (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len))); insert into t1_512 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t1_512 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_512 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t2_512 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_512 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); insert into t3_512 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t3_512 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t3_512 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); insert into t3_512 values (concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len))); explain extended select left(a1,7), left(a2,7) from t1_512 where a1 in (select b1 from t2_512 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where (`test`.`t1_512`.`a1`,(select `test`.`t2_512`.`b1` from `test`.`t2_512` where ((`test`.`t2_512`.`b1` > '0') and ((`test`.`t1_512`.`a1`) = `test`.`t2_512`.`b1`)))) select left(a1,7), left(a2,7) from t1_512 where a1 in (select b1 from t2_512 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_512 where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where ((`test`.`t1_512`.`a1`,`test`.`t1_512`.`a2`),(select `test`.`t2_512`.`b1`,`test`.`t2_512`.`b2` from `test`.`t2_512` where ((`test`.`t2_512`.`b1` > '0') and ((`test`.`t1_512`.`a1`) = `test`.`t2_512`.`b1`) and ((`test`.`t1_512`.`a2`) = `test`.`t2_512`.`b2`)))) select left(a1,7), left(a2,7) from t1_512 where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_512 where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where (`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( (select substr(`test`.`t2_512`.`b1`,1,512) from `test`.`t2_512` where (`test`.`t2_512`.`b1` > '0') ), (`test`.`t1_512`.`a1` in on distinct_key where ((`test`.`t1_512`.`a1` = ``.`substring(b1,1,512)`))))) select left(a1,7), left(a2,7) from t1_512 where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_512 where a1 in (select group_concat(b1) from t2_512 group by b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where (`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( (select group_concat(`test`.`t2_512`.`b1` separator ',') from `test`.`t2_512` group by `test`.`t2_512`.`b2` ), (`test`.`t1_512`.`a1` in on distinct_key where ((`test`.`t1_512`.`a1` = ``.`group_concat(b1)`))))) select left(a1,7), left(a2,7) from t1_512 where a1 in (select group_concat(b1) from t2_512 group by b2); left(a1,7) left(a2,7) set @@group_concat_max_len = 256; explain extended select left(a1,7), left(a2,7) from t1_512 where a1 in (select group_concat(b1) from t2_512 group by b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where (`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( (select group_concat(`test`.`t2_512`.`b1` separator ',') from `test`.`t2_512` group by `test`.`t2_512`.`b2` ), (`test`.`t1_512`.`a1` in on distinct_key where ((`test`.`t1_512`.`a1` = ``.`group_concat(b1)`))))) select left(a1,7), left(a2,7) from t1_512 where a1 in (select group_concat(b1) from t2_512 group by b2); left(a1,7) left(a2,7) drop table t1_512, t2_512, t3_512; set @blob_len = 1024; set @suffix_len = @blob_len - @prefix_len; create table t1_1024 (a1 blob(1024), a2 blob(1024)); create table t2_1024 (b1 blob(1024), b2 blob(1024)); create table t3_1024 (c1 blob(1024), c2 blob(1024)); insert into t1_1024 values (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len))); insert into t1_1024 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t1_1024 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_1024 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t2_1024 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_1024 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); insert into t3_1024 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t3_1024 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t3_1024 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); insert into t3_1024 values (concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len))); explain extended select left(a1,7), left(a2,7) from t1_1024 where a1 in (select b1 from t2_1024 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where (`test`.`t1_1024`.`a1`,(select `test`.`t2_1024`.`b1` from `test`.`t2_1024` where ((`test`.`t2_1024`.`b1` > '0') and ((`test`.`t1_1024`.`a1`) = `test`.`t2_1024`.`b1`)))) select left(a1,7), left(a2,7) from t1_1024 where a1 in (select b1 from t2_1024 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_1024 where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where ((`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a2`),(select `test`.`t2_1024`.`b1`,`test`.`t2_1024`.`b2` from `test`.`t2_1024` where ((`test`.`t2_1024`.`b1` > '0') and ((`test`.`t1_1024`.`a1`) = `test`.`t2_1024`.`b1`) and ((`test`.`t1_1024`.`a2`) = `test`.`t2_1024`.`b2`)))) select left(a1,7), left(a2,7) from t1_1024 where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_1024 where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where (`test`.`t1_1024`.`a1`,(select substr(`test`.`t2_1024`.`b1`,1,1024) from `test`.`t2_1024` where ((`test`.`t2_1024`.`b1` > '0') and ((`test`.`t1_1024`.`a1`) = substr(`test`.`t2_1024`.`b1`,1,1024))))) select left(a1,7), left(a2,7) from t1_1024 where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_1024 where a1 in (select group_concat(b1) from t2_1024 group by b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where (`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a1` in ( (select group_concat(`test`.`t2_1024`.`b1` separator ',') from `test`.`t2_1024` group by `test`.`t2_1024`.`b2` ), (`test`.`t1_1024`.`a1` in on distinct_key where ((`test`.`t1_1024`.`a1` = ``.`group_concat(b1)`))))) select left(a1,7), left(a2,7) from t1_1024 where a1 in (select group_concat(b1) from t2_1024 group by b2); left(a1,7) left(a2,7) set @@group_concat_max_len = 256; explain extended select left(a1,7), left(a2,7) from t1_1024 where a1 in (select group_concat(b1) from t2_1024 group by b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where (`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a1` in ( (select group_concat(`test`.`t2_1024`.`b1` separator ',') from `test`.`t2_1024` group by `test`.`t2_1024`.`b2` ), (`test`.`t1_1024`.`a1` in on distinct_key where ((`test`.`t1_1024`.`a1` = ``.`group_concat(b1)`))))) select left(a1,7), left(a2,7) from t1_1024 where a1 in (select group_concat(b1) from t2_1024 group by b2); left(a1,7) left(a2,7) drop table t1_1024, t2_1024, t3_1024; set @blob_len = 1025; set @suffix_len = @blob_len - @prefix_len; create table t1_1025 (a1 blob(1025), a2 blob(1025)); create table t2_1025 (b1 blob(1025), b2 blob(1025)); create table t3_1025 (c1 blob(1025), c2 blob(1025)); insert into t1_1025 values (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len))); insert into t1_1025 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t1_1025 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_1025 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t2_1025 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_1025 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); insert into t3_1025 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t3_1025 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t3_1025 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); insert into t3_1025 values (concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len))); explain extended select left(a1,7), left(a2,7) from t1_1025 where a1 in (select b1 from t2_1025 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where (`test`.`t1_1025`.`a1`,(select `test`.`t2_1025`.`b1` from `test`.`t2_1025` where ((`test`.`t2_1025`.`b1` > '0') and ((`test`.`t1_1025`.`a1`) = `test`.`t2_1025`.`b1`)))) select left(a1,7), left(a2,7) from t1_1025 where a1 in (select b1 from t2_1025 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_1025 where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where ((`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a2`),(select `test`.`t2_1025`.`b1`,`test`.`t2_1025`.`b2` from `test`.`t2_1025` where ((`test`.`t2_1025`.`b1` > '0') and ((`test`.`t1_1025`.`a1`) = `test`.`t2_1025`.`b1`) and ((`test`.`t1_1025`.`a2`) = `test`.`t2_1025`.`b2`)))) select left(a1,7), left(a2,7) from t1_1025 where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_1025 where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where (`test`.`t1_1025`.`a1`,(select substr(`test`.`t2_1025`.`b1`,1,1025) from `test`.`t2_1025` where ((`test`.`t2_1025`.`b1` > '0') and ((`test`.`t1_1025`.`a1`) = substr(`test`.`t2_1025`.`b1`,1,1025))))) select left(a1,7), left(a2,7) from t1_1025 where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x 1 - 02x 2 - 02x explain extended select left(a1,7), left(a2,7) from t1_1025 where a1 in (select group_concat(b1) from t2_1025 group by b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where (`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a1` in ( (select group_concat(`test`.`t2_1025`.`b1` separator ',') from `test`.`t2_1025` group by `test`.`t2_1025`.`b2` ), (`test`.`t1_1025`.`a1` in on distinct_key where ((`test`.`t1_1025`.`a1` = ``.`group_concat(b1)`))))) select left(a1,7), left(a2,7) from t1_1025 where a1 in (select group_concat(b1) from t2_1025 group by b2); left(a1,7) left(a2,7) set @@group_concat_max_len = 256; explain extended select left(a1,7), left(a2,7) from t1_1025 where a1 in (select group_concat(b1) from t2_1025 group by b2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where (`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a1` in ( (select group_concat(`test`.`t2_1025`.`b1` separator ',') from `test`.`t2_1025` group by `test`.`t2_1025`.`b2` ), (`test`.`t1_1025`.`a1` in on distinct_key where ((`test`.`t1_1025`.`a1` = ``.`group_concat(b1)`))))) select left(a1,7), left(a2,7) from t1_1025 where a1 in (select group_concat(b1) from t2_1025 group by b2); left(a1,7) left(a2,7) drop table t1_1025, t2_1025, t3_1025; create table t1bit (a1 bit(3), a2 bit(3)); create table t2bit (b1 bit(3), b2 bit(3)); insert into t1bit values (b'000', b'100'); insert into t1bit values (b'001', b'101'); insert into t1bit values (b'010', b'110'); insert into t2bit values (b'001', b'101'); insert into t2bit values (b'010', b'110'); insert into t2bit values (b'110', b'111'); explain extended select bin(a1), bin(a2) from t1bit where (a1, a2) in (select b1, b2 from t2bit); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1bit ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2bit ALL NULL NULL NULL NULL 3 100.00 Warnings: Note 1003 select conv(`test`.`t1bit`.`a1`,10,2) AS `bin(a1)`,conv(`test`.`t1bit`.`a2`,10,2) AS `bin(a2)` from `test`.`t1bit` where ((`test`.`t1bit`.`a1`,`test`.`t1bit`.`a2`),(`test`.`t1bit`.`a1`,`test`.`t1bit`.`a2`) in ( (select `test`.`t2bit`.`b1`,`test`.`t2bit`.`b2` from `test`.`t2bit` ), (`test`.`t1bit`.`a1` in on distinct_key where ((`test`.`t1bit`.`a1` = ``.`b1`) and (`test`.`t1bit`.`a2` = ``.`b2`))))) select bin(a1), bin(a2) from t1bit where (a1, a2) in (select b1, b2 from t2bit); bin(a1) bin(a2) 1 101 10 110 drop table t1bit, t2bit; create table t1bb (a1 bit(3), a2 blob(3)); create table t2bb (b1 bit(3), b2 blob(3)); insert into t1bb values (b'000', '100'); insert into t1bb values (b'001', '101'); insert into t1bb values (b'010', '110'); insert into t2bb values (b'001', '101'); insert into t2bb values (b'010', '110'); insert into t2bb values (b'110', '111'); explain extended select bin(a1), a2 from t1bb where (a1, a2) in (select b1, b2 from t2bb); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1bb ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2bb ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1003 select conv(`test`.`t1bb`.`a1`,10,2) AS `bin(a1)`,`test`.`t1bb`.`a2` AS `a2` from `test`.`t1bb` where ((`test`.`t1bb`.`a1`,`test`.`t1bb`.`a2`),(select `test`.`t2bb`.`b1`,`test`.`t2bb`.`b2` from `test`.`t2bb` where (((`test`.`t1bb`.`a1`) = `test`.`t2bb`.`b1`) and ((`test`.`t1bb`.`a2`) = `test`.`t2bb`.`b2`)))) select bin(a1), a2 from t1bb where (a1, a2) in (select b1, b2 from t2bb); bin(a1) a2 1 101 10 110 drop table t1bb, t2bb; drop table t1, t2, t3, t1i, t2i, t3i, columns; /****************************************************************************** * Test the cache of the left operand of IN. ******************************************************************************/ # Test that default values of Cached_item are not used for comparison create table t1 (s1 int); create table t2 (s2 int); insert into t1 values (5),(1),(0); insert into t2 values (0), (1); select s2 from t2 where s2 in (select s1 from t1); s2 0 1 drop table t1, t2; create table t1 (a int not null, b int not null); create table t2 (c int not null, d int not null); create table t3 (e int not null); insert into t1 values (1,10); insert into t1 values (1,20); insert into t1 values (2,10); insert into t1 values (2,20); insert into t1 values (2,30); insert into t1 values (3,20); insert into t1 values (4,40); insert into t2 values (2,10); insert into t2 values (2,20); insert into t2 values (2,40); insert into t2 values (3,20); insert into t2 values (4,10); insert into t2 values (5,10); insert into t3 values (10); insert into t3 values (10); insert into t3 values (20); insert into t3 values (30); explain extended select a from t1 where a in (select c from t2 where d >= 20); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 7 100.00 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a`,`test`.`t1`.`a` in ( (select `test`.`t2`.`c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), (`test`.`t1`.`a` in on distinct_key where ((`test`.`t1`.`a` = ``.`c`))))) select a from t1 where a in (select c from t2 where d >= 20); a 2 2 2 3 create index it1a on t1(a); explain extended select a from t1 where a in (select c from t2 where d >= 20); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL it1a 4 NULL 7 100.00 Using where; Using index 2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a`,`test`.`t1`.`a` in ( (select `test`.`t2`.`c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), (`test`.`t1`.`a` in on distinct_key where ((`test`.`t1`.`a` = ``.`c`))))) select a from t1 where a in (select c from t2 where d >= 20); a 2 2 2 3 insert into t2 values (1,10); explain extended select a from t1 where a in (select c from t2 where d >= 20); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL it1a 4 NULL 7 100.00 Using where; Using index 2 SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a`,`test`.`t1`.`a` in ( (select `test`.`t2`.`c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), (`test`.`t1`.`a` in on distinct_key where ((`test`.`t1`.`a` = ``.`c`))))) select a from t1 where a in (select c from t2 where d >= 20); a 2 2 2 3 explain extended select a from t1 group by a having a in (select c from t2 where d >= 20); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL it1a 4 NULL 7 100.00 Using index 2 SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having (`test`.`t1`.`a`,`test`.`t1`.`a` in ( (select `test`.`t2`.`c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), (`test`.`t1`.`a` in on distinct_key where ((`test`.`t1`.`a` = ``.`c`))))) select a from t1 group by a having a in (select c from t2 where d >= 20); a 2 3 create index iab on t1(a, b); explain extended select a from t1 group by a having a in (select c from t2 where d >= 20); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL it1a 4 NULL 7 100.00 Using index 2 SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having (`test`.`t1`.`a`,`test`.`t1`.`a` in ( (select `test`.`t2`.`c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), (`test`.`t1`.`a` in on distinct_key where ((`test`.`t1`.`a` = ``.`c`))))) select a from t1 group by a having a in (select c from t2 where d >= 20); a 2 3 explain extended select a from t1 group by a having a in (select c from t2 where d >= some(select e from t3 where max(b)=e)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL iab 8 NULL 7 100.00 Using index 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where 3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where Warnings: Note 1276 Field or reference 'test.t1.b' of SELECT #3 was resolved in SELECT #1 Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having (`test`.`t1`.`a`,(select `test`.`t2`.`c` from `test`.`t2` where (((`test`.`t2`.`d`,(select `test`.`t3`.`e` from `test`.`t3` where (max(`test`.`t1`.`b`) = `test`.`t3`.`e`) having ((`test`.`t2`.`d`) >= (`test`.`t3`.`e`))))) and ((`test`.`t1`.`a`) = `test`.`t2`.`c`)))) select a from t1 group by a having a in (select c from t2 where d >= some(select e from t3 where max(b)=e)); a 2 3 explain extended select a from t1 where a in (select c from t2 where d >= some(select e from t3 where b=e)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL iab 8 NULL 7 100.00 Using where; Using index 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where 3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where Warnings: Note 1276 Field or reference 'test.t1.b' of SELECT #3 was resolved in SELECT #1 Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a`,(select `test`.`t2`.`c` from `test`.`t2` where (((`test`.`t2`.`d`,(select `test`.`t3`.`e` from `test`.`t3` where ((`test`.`t1`.`b` = `test`.`t3`.`e`) and ((`test`.`t2`.`d`) >= `test`.`t3`.`e`))))) and ((`test`.`t1`.`a`) = `test`.`t2`.`c`)))) select a from t1 where a in (select c from t2 where d >= some(select e from t3 where b=e)); a 1 2 2 2 3 drop table t1, t2, t3; create table t2 (a int, b int, key(a), key(b)); insert into t2 values (3,3),(3,3),(3,3); select 1 from t2 where t2.a > 1 or t2.a = 3 and not t2.a not in (select t2.b from t2); 1 1 1 1 drop table t2; create table t1 (a1 int key); create table t2 (b1 int); insert into t1 values (5); explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found select min(a1) from t1 where 7 in (select b1 from t2 group by b1); min(a1) NULL set @save_optimizer_switch=@@optimizer_switch; set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='materialization=off,in_to_exists=on'; explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found select min(a1) from t1 where 7 in (select b1 from t2 group by b1); min(a1) NULL set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='semijoin=off'; explain select min(a1) from t1 where 7 in (select b1 from t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found select min(a1) from t1 where 7 in (select b1 from t2); min(a1) NULL set @@optimizer_switch=@optimizer_switch_local_default; set @@optimizer_switch='materialization=off,in_to_exists=on'; # with MariaDB and MWL#90, this particular case is solved: explain select min(a1) from t1 where 7 in (select b1 from t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables select min(a1) from t1 where 7 in (select b1 from t2); min(a1) NULL # but when we go around MWL#90 code, the problem still shows up: explain select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4; min(a1) NULL set @@optimizer_switch= @save_optimizer_switch; drop table t1,t2; create table t1 (a char(2), b varchar(10)); insert into t1 values ('a', 'aaa'); insert into t1 values ('aa', 'aaaa'); explain select a,b from t1 where b in (select a from t1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 select a,b from t1 where b in (select a from t1); a b prepare st1 from "select a,b from t1 where b in (select a from t1)"; execute st1; a b execute st1; a b drop table t1; CREATE TABLE t1 (f1 INT, f2 DECIMAL(5,3)) ENGINE=MyISAM; INSERT INTO t1 (f1, f2) VALUES (1, 1.789); INSERT INTO t1 (f1, f2) VALUES (13, 1.454); INSERT INTO t1 (f1, f2) VALUES (10, 1.668); CREATE TABLE t2 LIKE t1; INSERT INTO t2 VALUES (1, 1.789); INSERT INTO t2 VALUES (13, 1.454); set @save_optimizer_switch=@@optimizer_switch; set @@optimizer_switch=@optimizer_switch_local_default; SET @@optimizer_switch='semijoin=on,materialization=on'; EXPLAIN SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL distinct_key NULL NULL NULL 2 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join) 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2); COUNT(*) 2 set @@optimizer_switch= @save_optimizer_switch; DROP TABLE t1, t2; CREATE TABLE t1 ( pk int, a varchar(1), b varchar(4), c varchar(4), d varchar(4), PRIMARY KEY (pk) ); INSERT INTO t1 VALUES (1,'o','ffff','ffff','ffoo'),(2,'f','ffff','ffff','ffff'); CREATE TABLE t2 LIKE t1; INSERT INTO t2 VALUES (1,'i','iiii','iiii','iiii'),(2,'f','ffff','ffff','ffff'); set @save_optimizer_switch=@@optimizer_switch; set @@optimizer_switch=@optimizer_switch_local_default; SET @@optimizer_switch='semijoin=on,materialization=on'; EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 1 PRIMARY eq_ref distinct_key distinct_key 5 func 1 2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Rowid-ordered scan SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0); pk 2 SELECT pk FROM t1 WHERE (b,c,d) IN (SELECT b,c,d FROM t2 WHERE pk > 0); pk 2 DROP TABLE t1, t2; set optimizer_switch=@save_optimizer_switch; # # BUG#50019: Wrong result for IN-subquery with materialization # create table t1(i int); insert into t1 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10); create table t2(i int); insert into t2 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10); create table t3(i int); insert into t3 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10); select * from t1 where t1.i in (select t2.i from t2 join t3 where t2.i + t3.i = 5); i 1 2 3 4 set @save_optimizer_switch=@@optimizer_switch; set session optimizer_switch='materialization=off,in_to_exists=on'; select * from t1 where t1.i in (select t2.i from t2 join t3 where t2.i + t3.i = 5); i 1 2 3 4 set session optimizer_switch=@save_optimizer_switch; drop table t1, t2, t3; create table t0 (a int); insert into t0 values (0),(1),(2); create table t1 (a int); insert into t1 values (0),(1),(2); explain select a, a in (select a from t1) from t0; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t0 ALL NULL NULL NULL NULL 3 2 SUBQUERY t1 ALL NULL NULL NULL NULL 3 select a, a in (select a from t1) from t0; a a in (select a from t1) 0 1 1 1 2 1 prepare s from 'select a, a in (select a from t1) from t0'; execute s; a a in (select a from t1) 0 1 1 1 2 1 update t1 set a=123; execute s; a a in (select a from t1) 0 0 1 0 2 0 drop table t0, t1; set optimizer_switch='firstmatch=on'; # # MWL#90, review feedback: check what happens when the subquery # looks like candidate for MWL#90 checking at the first glance # but then subselect_hash_sj_engine::init_permanent() discovers # that it's not possible to perform duplicate removal for the # selected datatypes, and so materialization isn't applicable after # all. # set @blob_len = 1024; set @suffix_len = @blob_len - @prefix_len; create table t1_1024 (a1 blob(1024), a2 blob(1024)); create table t2_1024 (b1 blob(1024), b2 blob(1024)); insert into t1_1024 values (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len))); insert into t1_1024 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t1_1024 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_1024 values (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len))); insert into t2_1024 values (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len))); insert into t2_1024 values (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len))); explain select left(a1,7), left(a2,7) from t1_1024 where (a1,3) in (select substring(b1,1,1024), count(*) from t2_1024 where b1 > '0'); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 Using where 2 DEPENDENT SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 Using where select left(a1,7), left(a2,7) from t1_1024 where (a1,3) in (select substring(b1,1,1024), count(*) from t2_1024 where b1 > '0'); left(a1,7) left(a2,7) 1 - 01x 2 - 01x drop table t1_1024, t2_1024; set optimizer_switch=@subselect_sj_mat_tmp; set @subselect_mat_test_optimizer_switch_value=null; set @@optimizer_switch='materialization=on,in_to_exists=off,semijoin=off'; set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on'; create table t0 (a int); insert into t0 values (0),(1),(2); create table t1 (a int); insert into t1 values (0),(1),(2); explain select a, a in (select a from t1) from t0; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t0 ALL NULL NULL NULL NULL 3 2 SUBQUERY t1 ALL NULL NULL NULL NULL 3 select a, a in (select a from t1) from t0; a a in (select a from t1) 0 1 1 1 2 1 prepare s from 'select a, a in (select a from t1) from t0'; execute s; a a in (select a from t1) 0 1 1 1 2 1 update t1 set a=123; execute s; a a in (select a from t1) 0 0 1 0 2 0 drop table t0, t1; # # LPBUG#609121: RQG: wrong result on aggregate + NOT IN + HAVING and # partial_match_table_scan=on # create table t1 (c1 int); create table t2 (c2 int); insert into t1 values (1); insert into t2 values (2); set @@optimizer_switch='semijoin=off'; EXPLAIN SELECT SUM(c1) c1_sum FROM t1 WHERE c1 IN (SELECT c2 FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 2 SUBQUERY t2 system NULL NULL NULL NULL 1 SELECT SUM(c1) c1_sum FROM t1 WHERE c1 IN (SELECT c2 FROM t2); c1_sum NULL EXPLAIN SELECT SUM(c1) c1_sum FROM t1 WHERE c1 IN (SELECT c2 FROM t2) HAVING c1_sum; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 2 SUBQUERY t2 system NULL NULL NULL NULL 1 SELECT SUM(c1) c1_sum FROM t1 WHERE c1 IN (SELECT c2 FROM t2) HAVING c1_sum; c1_sum drop table t1, t2; # # BUG#52344 - Subquery materialization: # Assertion if subquery in on-clause of outer join # set @@optimizer_switch='semijoin=off'; CREATE TABLE t1 (i INTEGER); INSERT INTO t1 VALUES (10); CREATE TABLE t2 (j INTEGER); INSERT INTO t2 VALUES (5); CREATE TABLE t3 (k INTEGER); EXPLAIN SELECT i FROM t1 LEFT JOIN t2 ON (j) IN (SELECT k FROM t3); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 1 PRIMARY t2 ALL NULL NULL NULL NULL 1 Using where 2 SUBQUERY t3 system NULL NULL NULL NULL 0 const row not found SELECT i FROM t1 LEFT JOIN t2 ON (j) IN (SELECT k FROM t3); i 10 EXPLAIN SELECT i FROM t1 LEFT JOIN t2 ON (j) IN (SELECT max(k) FROM t3); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 1 PRIMARY t2 ALL NULL NULL NULL NULL 1 Using where 2 SUBQUERY t3 system NULL NULL NULL NULL 0 const row not found SELECT i FROM t1 LEFT JOIN t2 ON (j) IN (SELECT max(k) FROM t3); i 10 DROP TABLE t1, t2, t3; # # LPBUG#611622/BUG#52344: Subquery materialization: Assertion # if subquery in on-clause of outer join # CREATE TABLE t1 (c1 int); INSERT INTO t1 VALUES (1),(2); CREATE TABLE t2 (c2 int); INSERT INTO t2 VALUES (10); PREPARE st1 FROM " SELECT * FROM t2 LEFT JOIN t2 t3 ON (8, 4) IN (SELECT c1, c1 FROM t1)"; EXECUTE st1; c2 c2 10 NULL EXECUTE st1; c2 c2 10 NULL DROP TABLE t1, t2; # # Testcase backport: BUG#46548 IN-subqueries return 0 rows with materialization=on # CREATE TABLE t1 ( pk int, a varchar(1), b varchar(4), c varchar(4), d varchar(4), PRIMARY KEY (pk) ); INSERT INTO t1 VALUES (1,'o','ffff','ffff','ffoo'),(2,'f','ffff','ffff','ffff'); CREATE TABLE t2 LIKE t1; INSERT INTO t2 VALUES (1,'i','iiii','iiii','iiii'),(2,'f','ffff','ffff','ffff'); SET @@optimizer_switch='default,semijoin=on,materialization=on'; EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 1 PRIMARY eq_ref distinct_key distinct_key 5 func 1 2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 2 Using where SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0); pk 2 SELECT pk FROM t1 WHERE (b,c,d) IN (SELECT b,c,d FROM t2 WHERE pk > 0); pk 2 DROP TABLE t1, t2; # # BUG#724228: Wrong result with materialization=on and three aggregates in maria-5.3-mwl90 # CREATE TABLE t1 ( f2 int(11)) ; INSERT IGNORE INTO t1 VALUES ('7'),('9'),('7'),('4'),('2'),('6'),('8'),('5'),('6'),('188'),('2'),('1'),('1'),('0'),('9'),('4'); CREATE TABLE t2 ( f1 int(11), f2 int(11)) ENGINE=MyISAM; INSERT IGNORE INTO t2 VALUES ('1','1'); CREATE TABLE t3 ( f1 int(11), f2 int(11), f3 int(11), PRIMARY KEY (f1)) ; INSERT IGNORE INTO t3 VALUES ('16','6','1'),('18','3','4'),('19',NULL,'9'),('20','0','6'),('41','2','0'),('42','2','5'),('43','9','6'),('44','7','4'),('45','1','4'),('46','222','238'),('47','3','6'),('48','6','6'),('49',NULL,'1'),('50','5','1'); SET @_save_join_cache_level = @@join_cache_level; SET @_save_optimizer_switch = @@optimizer_switch; SET join_cache_level = 1; SET optimizer_switch='materialization=on'; SELECT f1 FROM t3 WHERE f1 NOT IN (SELECT MAX(f2) FROM t1) AND f3 IN (SELECT MIN(f1) FROM t2) AND f1 IN (SELECT COUNT(f2) FROM t1); f1 16 SET @@join_cache_level = @_save_join_cache_level; SET @@optimizer_switch = @_save_optimizer_switch; drop table t1, t2, t3; # # LPBUG#719198 Ordered_key::cmp_key_with_search_key(rownum_t): Assertion `!compare_pred[i]->null_value' # failed with subquery on both sides of NOT IN and materialization # CREATE TABLE t1 (f1a int, f1b int) ; INSERT IGNORE INTO t1 VALUES (1,1),(2,2); CREATE TABLE t2 ( f2 int); INSERT IGNORE INTO t2 VALUES (3),(4); CREATE TABLE t3 (f3a int, f3b int); set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,in_to_exists=off'; EXPLAIN SELECT * FROM t2 WHERE (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 3 SUBQUERY t1 ALL NULL NULL NULL NULL 2 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t2 WHERE (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1); f2 EXPLAIN SELECT (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used 3 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1); (SELECT f3a FROM t3) NOT IN (SELECT f1a FROM t1) NULL EXPLAIN SELECT * FROM t2 WHERE (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 3 SUBQUERY t1 ALL NULL NULL NULL NULL 2 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t2 WHERE (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1); f2 EXPLAIN SELECT (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used 3 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1); (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1) NULL drop table t1, t2, t3; # # LPBUG#730604 Assertion `bit < (map)->n_bits' failed in maria-5.3 with # partial_match_rowid_merge # CREATE TABLE t1 (f1 int NOT NULL, f2 int, f3 int) ; CREATE TABLE t2 (f1 int NOT NULL, f2 int, f3 int) ; INSERT INTO t1 VALUES (60, 3, null), (61, null, 77); INSERT INTO t2 VALUES (1000,6,2); set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,in_to_exists=off'; EXPLAIN SELECT (f1, f2, f3) NOT IN (SELECT COUNT(DISTINCT f2), f1, f3 FROM t1 GROUP BY f1, f3) FROM t2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 system NULL NULL NULL NULL 1 2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using filesort SELECT (f1, f2, f3) NOT IN (SELECT COUNT(DISTINCT f2), f1, f3 FROM t1 GROUP BY f1, f3) FROM t2; (f1, f2, f3) NOT IN (SELECT COUNT(DISTINCT f2), f1, f3 FROM t1 GROUP BY f1, f3) 1 drop table t1, t2; # # LPBUG#702301: MAX in select + always false WHERE with SQ # CREATE TABLE t1 (a int, b int, KEY (b)); INSERT INTO t1 VALUES (3,1), (4,2); CREATE TABLE t2 (a int); INSERT INTO t2 VALUES (7), (8); set @@optimizer_switch='materialization=on,in_to_exists=off,semijoin=off'; SELECT MAX(t1.b) AS max_res FROM t1 WHERE (9) IN (SELECT a FROM t2); max_res NULL EXPLAIN EXTENDED SELECT MAX(t1.b) AS max_res FROM t1 WHERE (9) IN (SELECT a FROM t2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL b 5 NULL 2 100.00 Using index 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Warnings: Note 1003 select max(`test`.`t1`.`b`) AS `max_res` from `test`.`t1` where (9,9 in ( (select `test`.`t2`.`a` from `test`.`t2` ), (9 in on distinct_key where ((9 = ``.`a`))))) set @@optimizer_switch='materialization=off,in_to_exists=on,semijoin=off'; SELECT MAX(t1.b) AS max_res FROM t1 WHERE (9) IN (SELECT a FROM t2); max_res NULL EXPLAIN EXTENDED SELECT MAX(t1.b) AS max_res FROM t1 WHERE (9) IN (SELECT a FROM t2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL b 5 NULL 2 100.00 Using index 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1003 select max(`test`.`t1`.`b`) AS `max_res` from `test`.`t1` where (9,(select `test`.`t2`.`a` from `test`.`t2` where (9 = `test`.`t2`.`a`))) DROP TABLE t1,t2;